US4471261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferromagnetic yoke and a deflection unit for a television display tube
Assignee: US Philips Corp
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Filing: 1982-01-26
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Granted: 1984-09-11
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Expires: 2002-01-26
Abstract
Abstract Annular ferromagnetic yoke for deflection units for television display tubes, having a conical inner surface which defines a longitudinal axis, and having an outer surface in which a first set of three grooves extending in the axial direction and a second set of three grooves extending in the axial direction are provided diametrically opposite each other, the grooves having accurately ground bottoms and walls which form reference faces by which the position of the axis of the yoke is fixed.
Inventors
- 👤 Nicolaas F. Meier
- 👤 Harm Van Duinen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:10
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/72; H01J29/76; H01J2229/00; H01J2229/70; H01J2229/703; H01J2229/7031
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
80 words
In an annular ferromagnetic yoke for deflection units for television display tubes, having a conical inner surface about a longitudinal axis, and having an outer surface in which a first and a second set of grooves extending in the direction of the longitudinal axis are provided symmetrically with respect to a first plane through the longitudinal axis, the improvement wherein the grooves have accurately ground limits which form reference faces by which the position of the longitudinal axis is fixed.
Claim 2
Dependent Claim
80 words
In an annular ferromagnetic yoke for deflection units for television display tubes, having a conical inner surface about a longitudinal axis, and having an outer surface in which a first and a second set of grooves extending in the direction of the longitudinal axis are provided symmetrically with respect to a first plane through the longitudinal axis, the improvement wherein the grooves have accurately ground limits which form reference faces by which the position of the longitudinal axis is fixed.
Claim 3
Dependent Claim
25 words
A yoke as claimed in claim 1, wherein each set of grooves comprises three grooves each of substantially rectangular cross-section and having the same pitch.
Claim 4
Dependent Claim
26 words
A yoke as claimed in claim 1 or 2, wherein the reference faces are situated on two sets of planes intersecting each other at right angles.
Claim 5
Dependent Claim
30 words
A yoke as claimed in claim 1 or 2 wherein on at least one end the bottom and a side wall of the grooves are parallel to the longitudinal axis.
Claim 6
Dependent Claim
54 words
A yoke as claimed in claim 1 or 2 wherein said yoke consists of two ring halves which are held together by clamping springs each engaging in a groove of the first set and in a groove of the second set present on either side of the connection surfaces of the individual ring halves.
Claim 7
Dependent Claim
38 words
A yoke as claimed in claim 5, wherein the clamping springs are provided near the centre of the yoke so as to keep the ends of the grooves free to serve as a reference in assembling the yoke.
Claim 8
Dependent Claim
27 words
A yoke as claimed in claim 2 wherein the yoke is divided into two parts along planes extending through the central grooves of each set of grooves.
Claim 9
Dependent Claim
28 words
A yoke as claimed in claim 3 wherein on at least one end the bottom and a side wall of the grooves are parallel to the longitudinal axis.
Claim 10
Dependent Claim
52 words
A yoke as claimed in claim 3 wherein said yoke consists of two ring halves which are held together by clamping springs each engaging in a groove of the first set and in a groove of the second set present on either side of the connection surfaces of the individual ring halves.
Claim 11
Dependent Claim
52 words
A yoke as claimed in claim 4 wherein said yoke consists of two rings halves which are held together by clamping springs each engaging in a groove of the first set and in a groove of the second set present on either side of the connection surfaces of the individual ring halves.
Claim 12
Dependent Claim
27 words
A yoke as claimed in claim 3 wherein the yoke is divided into two parts along planes extending through the central grooves of each set of grooves.
Claim 13
Dependent Claim
27 words
A yoke as claimed in claim 4 wherein the yoke is divided into two parts along planes extending through the central grooves of each set of grooves.
Claim 14
Dependent Claim
27 words
A yoke as claimed in claim 5 wherein the yoke is divided into two parts along planes extending through the central grooves of each set of grooves.
References Cited (Backward Citations)
US4200851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-11 | 1988-03-12 | 1988-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-11 | 1992-03-12 | 1992-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-11 | 1996-03-12 | 1996-09-11 | $7700.00 | Window Closed / Lapsed |